I totally forgot something. The sun in Hawaii is HOT. I burned myself quite badly and yes, I was wearing a very strong and protective sunscreen. There is a different type in Hawaii, I think it has titanium in it. (REally!) So get your sunscreen there.
The volcano would be wonderful to see. You can take a 'chopper tour and view it from the sky.
In addition to being more expensive, I found the "hands out for a tip" to be a little overwhelming. It seems everyone had a hand out. And we all know what I think of THAT!
We too stayed at the Outrigger on Waikiki. There is another hotel further along (toward Diamond Head). It has an Asian name and we said if we ever returned we'd stay there. I'll rack my brain and try to remember.
$500 a night for Outrigger is not worth it. Honest. It's a very nice place, clean and well served, but it's not a fancy hotel at all. For $500 a night, I'd be disappointed.
I'll go look for that other hotel.